Straight Outta My Kitchen Fun Food Fact Monday. Arachibutyrophobia is the fear of Peanut Butter Sticking to the roof of the mouth fear of peanut butter sticking to the roof of your mouth is a rare one, it may occur more often than you think.Arachibutyrophobia is the fear of Peanut Butter Sticking to the roof of the mouth fear of peanut butter sticking to the roof of your mouth is a rare one, it may occur more often than you think.